To upgrade Centos 8

sudo dnf clean all
sudo rm -r /var/cache/dnf
sudo dnf upgrade --exclude=gitlab-ce

PS: after ending support to Centos8:

sudo sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
sudo sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*
sudo yum update -y

To upgrade Gitlab|Mattermost

It is important to follow the upgrade path as indicated here:

tools:

https://gitlab-com.gitlab.io/support/toolbox/upgrade-path/

https://docs.gitlab.com/ee/update/index.html#upgrade-paths

Target version	Your version	Supported upgrade path	Note
14.8.2	13.10.2	13.10.2 → 13.12.15 → 14.0.12 → 14.8.2	Two intermediate versions are required: 13.12 and 14.0, then 14.8.2.

then

# RHEL/CentOS 8

version:

•  =sudo gitlab-rake gitlab:env:info= 

Maintenace mode:

• gitlab-ctl deploy-page up
• gitlab-ctl deploy-page down

Disable autobackup before upgrade

sudo touch /etc/gitlab/skip-auto-backup
sudo rm /etc/gitlab/skip-auto-backup

dnf --showduplicates list gitlab-ce

touch /etc/gitlab/skip-auto-backup

sudo gitlab-ctl reconfigure ---> it is important to do it after each upgrading

if it fails due to pending jobs:

# For Omnibus installations:
sudo gitlab-rails runner -e production 'puts Gitlab::BackgroundMigration.remaining'

sudo gitlab-ctl status

Useful path

Httpd conf:

• gitlab:
  • /var/opt/gitlab/nginx/conf/gitlab-http.conf
• mattermost:
  • /var/opt/gitlab/nginx/conf/gitlab-mattermost-http.conf

Gitlab conf:

• /etc/gitlab/gitlab.rb

Mattermost conf:

• /var/opt/gitlab/mattermost/config.json

How to delete mattermost user

• vim /var/opt/gitlab/mattermost/config.json

  • "EnableLocalMode": true,

  • sudo gitlab-ctl restart mattermost

• cd /opt/gitlab/embedded
  • sudo bin/mmctl --local user delete xx.yy@ego-gw.it --config /var/opt/gitlab/mattermost/config.json
  • y
  • y
• vim /var/opt/gitlab/mattermost/config.json
  • "EnableLocalMode": false,
  • sudo gitlab-ctl restart mattermost

How to modify sender domain from @gitlab.et-gw.eu to @et-gw.eu

You can follow this wiki page

here

and modify /etc/postfix/main.cf adding these row:

#relayhost = $mydomain
relayhost = mail.ego-gw.it
#relayhost = [gateway.my.domain]

restart postfix